Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b42de5d0da0ae24…

MALICIOUS

PDF

70.0 KB Created: 2021-03-30 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eb5512b2deac833bda7f729de161a5ba SHA-1: e54c4506b03c4e83d8b5b90ac2b8f8d1998cb1fa SHA-256: 9b42de5d0da0ae24a78ff15c0bcc39bd1018d0c43ef7a3d3a66097cb2e683c57
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating the redirection of users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=2010+lexus+rx+350+ac+problems PDF link annotation
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/boxivopijosakovude.pdfIn PDF document text
    • http://xugutolajon.22web.org/gizewapaja.pdfIn PDF document text
    • http://glossywp.online/25659323347fluo7.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/c3cf3524.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/xojajoje_roxisok.pdfIn PDF document text
    • http://segwaywheelchair.ru/can_a_dvr_go_baduct9p.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/2d8fca.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/c90c48f30957b.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/gihbBhd/87043211710.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/vozowajoruda.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/3ijJVje/bird_dogs_definition_in_real_estate.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/8928201.pdfIn PDF document text
    • https://cdn.sqhk.co/voduzetefir/jdifygj/rosit.pdfIn PDF document text
    • http://bedomukuruxe.22web.org/bedutizovuwav.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/342539f4cea36f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55ee94f-6cf0-49d1-97e3-838c44473dc1/kibawavabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db59036-3f8f-42d1-af9c-fd8a64bea72f/introductory_econometrics_a_modern_approach_6th_edition_solutions_manual.pdfIn PDF document text
    • http://pipovafalalum.rf.gd/how_to_get_taylor_scale_to_pounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3c7ce1-2fc3-44f6-8590-b339158fe599/lakodovaveduzepexajubevij.pdfIn PDF document text
    • http://sabarudijavu.epizy.com/tomirufarisanedimetip.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31D 5804 bytes
SHA-256: 5d23baa571ec0a0734c6fb8d1df872d8a16de94a4e7a811e6ebb1a96af530b85
font_01_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 10496 bytes
SHA-256: c75be3a7f113110752e01a7d34ddc3f0bd90332f4ff1832cdb427892eda488eb